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Liu, J.,Chan, S.H.J.,Brock-Nannestad, T.,Chen, J.,Lee, S.Y.,Solem, C.,Jensen, P.R. Academic Press 2016 Metabolic engineering Vol.36 No.-
Biocompatible chemistry is gaining increasing attention because of its potential within biotechnology for expanding the repertoire of biological transformations carried out by enzymes. Here we demonstrate how biocompatible chemistry can be used for synthesizing valuable compounds as well as for linking metabolic pathways to achieve redox balance and rescued growth. By comprehensive rerouting of metabolism, activation of respiration, and finally metal ion catalysis, we successfully managed to convert the homolactic bacterium Lactococcus lactis into a homo-diacetyl producer with high titer (95mM or 8.2g/L) and high yield (87% of the theoretical maximum). Subsequently, the pathway was extended to (S,S)-2,3-butanediol (S-BDO) through efficiently linking two metabolic pathways via chemical catalysis. This resulted in efficient homo-S-BDO production with a titer of 74mM (6.7g/L) S-BDO and a yield of 82%. The diacetyl and S-BDO production rates and yields obtained are the highest ever reported, demonstrating the promising combination of metabolic engineering and biocompatible chemistry as well as the great potential of L. lactis as a new production platform.
Fion C. H. Lee,Alan H. S. Chan 대한산업공학회 2007 Industrial Engineeering & Management Systems Vol.6 No.1
This study investigated the optimum positions and warning foreperiod for auditory signals with an experiment on spatial stimulus-response (S-R) compatibility effects. The auditory signals were presented at the front-right, front-left, rear-right, and rear-left positions from the subjects, whose reaction times and accuracies at different spatial mapping conditions were examined. The results showed a significant spatial stimulus-response compatibility effect in which faster and more accurate responses were obtained in the transversely and longitudinally compatible condition while the worst performance was found when spatial stimulus-response compatibility did not exist in either orientation. It was also shown that the transverse compatibility effect was found significantly stronger than the longitudinal compatibility effect. The effect of signal position was found significant and post hoc test suggested that the emergent warning alarm should be placed on the front-right position for right-handed users. The warning foreperiod prior to the signal presentation was shown to influence reaction time and a warning foreperiod of 3 s is found optimal for the 2-choice auditory reaction task.
TEM investigation of hydrogen-implanted and annealed single-crystal SrTiO3
G.K.H. Pang,C.W. Tai,Y. Wang,W.L. Liu,Z.T. Song,S.L. Feng,H.L.W. Chan,C.L. Choy 한국물리학회 2006 Current Applied Physics Vol.6 No.3
In this study, the structural properties of single-crystal SrTiO3 implanted with H+ have been investigated by transmission electronmicrocopy (TEM). The investigation was carried out on an as-implanted sample and samples after annealing at 500.C and 700 .Cfrom the implanted energy similar to the process in the case of silicon. The as-implanted sample shows large out-of-plane strain alsosimilar to the report in silicon. The microcavities are lled with amorphous material as the result of complicated interaction of the defectsduring the annealing.
Lee, Fion C.H.,Chan, Alan H.S. Korean Institute of Industrial Engineers 2007 Industrial Engineeering & Management Systems Vol.6 No.1
This study investigated the optimum positions and warning foreperiod for auditory signals with an experiment on spatial stimulus-response (S-R) compatibility effects. The auditory signals were presented at the front-right, front-left, rear-right, and rear-left positions from the subjects, whose reaction times and accuracies at different spatial mapping conditions were examined. The results showed a significant spatial stimulus-response compatibility effect in which faster and more accurate responses were obtained in the transversely and longitudinally compatible condition while the worst performance was found when spatial stimulus-response compatibility did not exist in either orientation. It was also shown that the transverse compatibility effect was found significantly stronger than the longitudinal compatibility effect. The effect of signal position was found significant and post hoc test suggested that the emergent warning alarm should be placed on the front-right position for right-handed users. The warning foreperiod prior to the signal presentation was shown to influence reaction time and a warning foreperiod of 3 s is found optimal for the 2-choice auditory reaction task.
Kim, Su Jae,Cha, Su Young,Kim, Ji Young,Shin, Jong Moon,Cho, Yong Chan,Lee, Seunghun,Kim, Won-Kyung,Jeong, Se-Young,Yang, Y. S.,Cho, Chae Ryong,Choi, H. W.,Jung, Myung-Hwa,Jun, Byeong-Eog,Kwon, Ki-Yon American Chemical Society 2012 The Journal of Physical Chemistry Part C Vol.116 No.22
<P>There have been many studies of ferromagnetism in ZnCoO, and the results have been controversial. Secondary phases, such as Co oxides and Co metal clusters, in ZnCoO are easily produced during treatment, but the formation conditions are not well understood. We fabricated samples under hydrogen-injection conditions at different heat-treatment temperatures and examined the conditions by using synchrotron X-ray analysis under which Co<SUB>3</SUB>O<SUB>4</SUB> appeared or was transformed into Co metal. We investigated the transforming process of the ferromagnetic origin from intrinsic to extrinsic nature via intermediate region competition by Co–H–Co and Co metal cluster and suggest conditions that induce ferromagnetic spin ordering in ZnCoO due to Co–H–Co complexes through hydrogen mediation.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jpccck/2012/jpccck.2012.116.issue-22/jp300536w/production/images/medium/jp-2012-00536w_0010.gif'></P>
임욱,강병환,유찬세,이영신,조현민,이우성,강남기 한국마이크로전자및패키징학회 2000 추계 기술심포지움 논문집 Vol.2 No.1
Non-aqueous tape casting of LTCC with PVB binder has been studied in a continuous tape casting machine. The aim of the study was to evaluate this type of system in the different Binder/Plasticizer and solid content compositions. Each four slurry compositions were used in the experiments with varied binder/plasticizer and solid content. All the slurries gave good quality tapes with smooth surfaces without blisters or pinholes. The highest mechanical properties was obtained for the B/P=3.0, powder content 70vo1% composition from 52 ㎛ green tapes, a tensile strength of 4.6 MPa and a linear extension of 29.5%.
이우성,조현민,임욱,유찬세,이영신,강남기 한국마이크로전자및패키징학회 2000 추계 기술심포지움 논문집 Vol.2 No.1
Brazing characteristics of the LTCC(Low Temperature Co-fired Ceramics)/Kovar(Fe-Ni-Co alloy) was investigated. Kovar is one of the typical material for the lid of MCM and packages. In case of alumina package, Brazing process is done by higher temperature profile than 800 ℃ and Ag-Cu alloy. But, LTCC has sintering temperature near 850℃. So, it is difficult to use the same process as alumina brazing. The adhesion strength of the brazed part is affected by brazing alloy and metallization properties between conductor pattern and LTCC material. We investigated brazing characteristics of the LTCC/Kovar using various Urazing alloys(Ag-Cu, Au-Sn) and process conditions. And, we examined the influence of the glass contents in conductor on the brazing characteristics of the LTCC/Kovar.
Suh, S.S.,Yoon, W.Y.,Kim, D.H.,Kwon, S.U.,Kim, J.H.,Kim, Y.U.,Jeong, C.U.,Chan, Y.Y.,Kang, S.H.,Lee, J.K. Pergamon Press 2014 ELECTROCHIMICA ACTA Vol.148 No.-
The development of a method for synthesizing granulated silicon oxide nanoparticles (SiO<SUB>x</SUB> NPG) via a thermal plasma and water granulation process and determination of the optimum stoichiometry of silicon oxide (SiO<SUB>x</SUB>) for achieving high electrochemical performance of an anode based on the developed material are presented herein. The structure of the SiO<SUB>x</SUB> NPGs was confirmed by means of X-ray fluorescence, transmission electron microscopy, and X-ray diffraction. A high initial capacity of ~1196 mA.h.g<SUP>-1</SUP> was achieved using the fabricated SiO<SUB>x</SUB> anode with x ~1.06, giving rise to a Coulombic efficiency of 75% after the first cycle. Further combination of SiO<SUB>x</SUB> with graphite (3 wt%) for use as an anode gave rise to high capacity (397 mA.h.g<SUP>-1</SUP>) and a very high Coulombic efficiency of 99.99% after 200 cycles. The physical properties of the synthesized materials were investigated based on micrometric analysis. On the basis of the volume expansion and cycle capacity, the optimal oxygen ratio of SiO<SUB>x</SUB> was determined to be x ~1.06.
Micro-ultrasonic welding using thermoplastic-elastomeric composite film
Chan, W.X.,Ng, S.H.,Li, K.H.H.,Park, W.T.,Yoon, Y.J. Elsevier 2016 Journal of materials processing technology Vol. No.
<P>A composite film of PMMA microspheres in PDMS is used as the fusion layer to avoid trapped air and to restrict the flow of the melted polymer during welding. The matrix material selection and distribution of PMMA microspheres is determined by the 1-D theoretical model. The theoretical work reveals that the difference in dynamic modulus between the matrix material and PMMA is the most significant contribution to the viability of this composite ultrasonic welding film. The experiment is conducted with PDMS as the matrix material to determine effect of the concentration of PMMA microspheres as micro energy directors on the welding strength and quality of the proposed methodology with the chosen composite. While there are no visible signs of trapped air in all specimens, the resultant welding strength in this methodology is limited by the particle size range of the PMMA microspheres. For ultrasonic energy input of 1 kJ on a 32 mm x 32 mm sample, the optimum concentration of PMMA microspheres is found to be 0.24. (C) 2016 Elsevier B.V. All rights reserved.</P>